Property:Has grind inputs
From Fallen London Wiki (Staging)
Change propagation updates are pending (1 job estimated) and it is recommended to wait with modifications to a property until the process has been finalized to prevent intermediary interruptions or contradictory specifications.
A Boolean property indicating whether a grind requires any named inputs before evaluation. It exists because, AFAIK, there is no way to specify that Property:Has grind input is not set for a page in {{#ask}}
queries.